I almost started looking this morning, but didn't. Not out of virtue, only I got distracted with other things and now the temptation is a lot less. Which is how it always works.
Someone else mentioned that part of the self-discipline is being satisfied with your partner. I think that's very true: my wife is lovely and sexy and willing, but isn't a hot young thing any more. If I fill my mind with those girls (who will never smile at me, or go for a walk, or help with a kid's problem, or nurse me when I'm sick, still less actually have sex with me), eventually I'll subconsciously compare her to them and she'll come up wanting, because that's how nature works.